A study of cyclic plastic stresses at a notch root.
Cyclic plastic stresses at notch roots in aluminum alloy sheet specimens under constant- amplitude repeated tension and reversed loading
STRESS CONCENTRATION↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Preliminary Wind-Tunnel Investigation of the Performance of Republic F-105 Wing-Root Inlet Configurations at Various Angles of Attack and a Mach Number of 2.01
A 1/13-scale model of the forebody of the Republic F-105 with twin-duct wing-root inlets was tested in the Langley 4- by 4-foot supersonic pressure tunnel through a range of angle of attack from -4 deg to 15 deg at a Mach number of 2.01 and a Reynolds number of approximately 3.4 x 10(exp 6) per foot. The tests were made with four configurations which incorporated varying amounts of sweep and stagger of the inlet leading edges, modifications to the areas of the boundary-layer diverter floor plate, and modifications to the area of the boundary-layer diverter bleed slots. The highest overall pressure recovery at an angle of attack of 0 deg (average total-pressure recovery, 0.84 mass-flow ratio, 0.98) was achieved with configuration having an inlet leading-edge sweep angle of 58 deg with no leading-edge stagger. Stagger was found to improve the angle-of- attack performance, but at a sacrifice in inlet efficiency for an angle of attack of 0 deg. The boundary-layer diverter floor height, of the order of one boundary-layer thickness, was satisfactory for bypassing the fuselage boundary layer. The boundary-layer diverter-plate bleed slots were effective in increasing the total-pressure recovery of the inlet. The total-pressure-recovery contour plots, taken at the compressor-face station, indicate the existence of high-velocity "cores" throughout the inlet operating range.
Kouyoumjian, W. L.↗
Effects of Plant Growth Hormones on Plant Development in the Absence of Gravitational Effects. the Effect of Weightlessness on the Growth and Orientation of Roots and Shoots of Monocotyledonous Seedlings
Hormone effects on plant growth in absence of gravity, and effect of weightlessness on growth and orientation of roots and shoots of monocotyledenous seedlings in biosatellite
GROWTH↗
Root Locus Asymptotes for the Sum of Two Polynomials of the Same Degree
Root locus asymptotes for sum of two polynomials of same degree
THEOREM PROVING↗
A square root formulation of the Kalman- Schmidt filter.
Kalman filter alternate form extended to include multiple simultaneous correlated measurements, testing with ballistic model and using square root formulation for trajectory determination
KALMAN-SCHMIDT FILTER↗
A square root formulation of the Kalman- Schmidt filter.
Kalman filter alternate form extended to include multiple simultaneous correlated measurements, testing with ballistic model and using square root formulation for trajectory determination
TRAJECTORY CONTROL↗
Elastoplastic stress-strain behavior at notch roots in sheet specimens under constant-amplitude loading
Elastoplastic stress-strain behavior at notch roots in sheet specimens under constant amplitude loading
Crews, J. H., Jr.↗
Automated generation of distributed-lumped- active network design charts by digital computer root-locus techniques
Automated generation of distributed-lumped-active network design charts by digital computer root- locus technique
Huelsman, L. P.↗
Two square root algorithms utilizing multiplication as the iterative operator
Algorithms for generating and implementing square root function using high speed multipliers
Goodman, J. R.↗
Remote sensing applications in forestry. The development of spectro-signature indicators of root disease impacts on forest stands Annual progress report
Spectral signature indicators of root disease impacts on forest stands
Wear, J. F.↗
Extension of square-root filtering to include process noise.
Square root filters algorithms based on covariance and invariance matrices extended to include process noise effects
Dyer, P.↗
Synthesis of systems with dominant complex roots
Multiparameter systems with dominant complex roots constrained by degrees of freedom to construct reduced characteristic equation
Cadena, J. E.↗
A generalized root locus following technique
Feedback control system characteristic equation generalized root locus following technique using straight line approximation
Mcdaniel, W. L., Jr.↗
Automatic error bounds for real roots of polynomials having interval coefficients
Polynomials with interval coefficients, presenting Newton Raphson algorithm for real roots error bounds
Hanson, R. J.↗
An examination of simple coordinate transformations in the Z-plane and W-plane for root locus analysis of sampled-data systems
Examination of simple coordinate transformations in Z-plane and W-plane for root locus analysis of sampled data systems
Kozoil, J. S., Jr.↗
An approximate root locus method in the S plane for sampled-data systems
Approximate root locus method in S plane for sampled data systems, mapping constant frequency and constant damping ratio loci onto W plane
Koziol, J. S., Jr.↗
The development of spectro-signature indicators of root disease
The development and testing of airborne sensors that might be effective in discrimination root rot infected trees from healthy ones are outlined. The sensing device is composed of a thermal infrared radiometer and an instant replay video scan system.
Wear, J. F.↗